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This excerpt is from the Lakes SOS app:Other Common Name(s): Asiatic Clam; Prosperity Clam; Pygmy Clam; Golden Clam; Good Luck ClamOrigin: AsiaNonnative Range: Has spread throughout most states, specifically in the eastern US. See USGS map for details on Asian clam distributionSize: Small (size varies); juveniles are 1 mm; adults as large as 5 cm wideDescription: Light green, yellowish to black-brown; oval-triangular brown shells; dorsal umbo (beak) at the peak of the shellHabitat: Sandy substrates in freshwater; colonize near shore but may occur in deeper waterHow they are Spread: Transported by boats, live wells and bait buckets; mucous thread allows them some mobility to move around lake bottoms; larva is dispersed and is carried by currents; imported sand and aquariumsThreat: Compete with and displace native species; alter the food chain; damage equipment; in large numbers can increase nitrogen contributing to algae growth; outcompete native mussels due to more rapid filter feeding; die off can create lethal doses of ammonia and kills native mussels and fishOther Information: Are hermaphrodites; one adult can start a population; uses its siphon to filter feed suspended phytoplankton and its foot to pedal feed on bottom sediment; spawn from July through September; prolific and reach sexual maturity in a few months; benthic mats are the only effective means of eradication but can only be used in ideal lake bottom conditionsAbove slide from the Quick ID section of Lakes SOS